Insulating material and method of manufacturing same.



. UNITED STATES PATENT QFFIGE.

GEORGE KELLY, OF HINSDALE, ILLINOIS.

, Specification of Letters Patent.

Patented Nor r. 13, 19 06,

Application fil d April 24:, 1906. Serial No. 313,429.

To aZZ whom it may concern:

Be it known that I, GEORGE KELLY, a citizen of the United States,residing at Hinsdale, in the county of Dupage and State of Illinois,have invented a new and useful Insulating Material and Method ofManufacturin the Same, of which the following is a speci. cation.

In the manufacture of zinc oXid the vapors or fumes from the roastedzinc ores placed in the furnaces ascend and are forced or blown throughlarge metal tubes for a considerable distance. At the ends of said tubesare located woven-fabric chutes, the fabric chutes having been found tobe most efficient for conveying the condensed oXid into the receptaclesfor the same. It is a well-known fact to those skilled in the art thatthe fabric of which the chutes are made .soon becomes scorched and unfitfor use, necessitating the constant renewal of the chutes and thediscarding of the old material. The discarded fabric is, however,thoroughly saturated with the oXid, and I have discovered that thismaterial, with the employment of other inexpensive ingredients, can bemade into highrade insulating material at small cost, and it 1s theprimary object of this invention 'to thus utilize the same.

There are a number of ways in which the invention may be practiced andthe desired article roduced. For instance, the discarded impregnatedcloth or fabric may be cut into sheets of the desired size and moistenedby brushing them with or dipping them into a liquid vulcanizing andbinding composition. While this composition may perhaps be made ofdifferent ingredients, it is referably com osed of rubber, sulfur, andliquid glass, (si icate of sodium.) These ingredients are preferably,though not necessarily, substantially of the followin proportions,measured by weight: ninetyve arts,

of liquid glass, ten to fifteen parts of ru ber, and five parts offlowers of sulfur. The

sheets, after having been moistened, are' placed one upon the other,allowed to artly dry or set, are afterward pressed, and nally vulcanizedunder pressure and at moderate heat. The resultant product is ahigh-grade electric insulating board, slab, plate, or the like that isthoroughly homogeneous, will withstand high voltage without breakindown, is both fire and moisture proof, an is capable of withstandingcomparatively heavy mechanical stress or strains.

, The use of theabove ingredients is impor tant. In thefirst lace,thefabric constitutes a strong body, tfi therein cooperates with therubber and sulfur in formlng an excellent binder and vulcanizing agent,and the silicate of sodium or liquid glass serves not only to make thearticle fireproof, but is itself a binder, and, furthermore, acts as asolvent or vehicle for the e zinc oxid impregnated sulfur and rubber,causing the same to thor- I oughly saturate thefabric and be brought,

Still another mode of producing the article is to em loy the binding andvulcanizingcompoun set forth in 'copending application, Serial No. 312,4i1. forth, said compound consists of .a mineral vulcanizable gum orasphalturn, preferably that commercially known as Gilsonite and liquidglass. Equal parts, by weight, of these ingredients are takeneand arethoroughly commingled." The above-described discarded fabric impregnawith zinc oxid is ground up to theproperconsistency in any ordinaryrubber-mill with the above compound and is then rolled or otherwisepressed or formed into sheets, tubes, or other articles, which arevulcanized under pressure and heat. The resultant product is a denseoompact article having the advantages of the mate'rial first described.

' Having thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent, is

1. That improvement in the process of manufacturing insulating material,which consists in intermingling with a fiber havin zinc oxid' therein, avulcanizing-binder, an

vulcanizing the composition under heat and pressure.

2. That improvement in the process of manufacturing insulating material,which consists in intermingling with waste fiber having zinc oxidincorporated therewith, a vulcanizing-binder, and vulcanizing andpressing the composition.

The articles thus As thereln set 3. That improvement in the process ofmanufacturing insulating material, which consists in taking a fabricimpregnated with zinc oXid, incorporating therewith a binder andvulcanizing agent, and vulcanizing the composition under heat andpressure.

4. That improvement in the process of manufacturing insulating material,which consists in taking a fabric impregnated with zinc oXid,incorporating therewith a binder and vulcanizing agent, and afireproofing material, and vulcanizing the composition.

5 That improvement in the process of manufacturing insulating material,which consists in taking a waste fabric impregnated with zinc oXid,incorporating therewith a vulcanizing-gum, and vulcanizing the .composi*tion.

6. That improvement in the process of manufacturing insulating material,which consists in taking fabric impregnated with zinc oXid,incorporating therewith a vulcanizing-gum and a fireproofing material,and vulcanizing the same.

7. That improvement in the process of manufacturing insulating material,which consists in taking fabric impregnated with zinc oxid,incorporating therewith rubber, and vulcanizing the composition.

8. That improvement in the process of manufacturing insulating material,which consists in taking fabric impregnated with zincoXid, incorporatingtherewith rubber and sulfur, and vulcanizi'ng the composition,

9. That improvement in the process of manufacturing insulating material,which consists in taking fabric impregnated with zinc" oxid,incorporating therewith rubber, sulfur and liquid glass, and vulcanizingthe composition.

10. That improvement in the process of manufacturing insulatingmaterial, which eaaeee consists disintegrating fabric impregnated withan oXid, intermingling therewith a vulcanizing agent, and afterwardvulcanizing the composition.

11. That improvement in the process of manufacturing insulatingmaterial, which consists in disintegrating waste fabric that isimpregnated with an oXid, intermingling therewith a vulcanizing agentand a fireproofing material, and. afterward vulcanizing the compositionunder heat and pressure.

12. That improvement in the process of manufacturing insulatingmaterial, disintegrating fabric impregnated with zinc oXid,interming'L-ing therewith rubber, sulfur and liquid glass,"and formingarticles of said composition.

13. As an article of manufacture, a vulcanized insulating material,comprising a fabric impregnated with oXid of zinc, and a vulcanizingagent and binder.

14. As an article of manufacture, a vulcanized insulating materialcomprising fabric impregnated with maid of zinc, a vulcanizing agent anda fireproofing material.

15. As an art cle of manufacture,,a,vulcanized insulating materialcomprising a fabric impregnated with oxid of zinc, and a bindercomprising rubber, sulfur and liquid glass.

16. As an article of manufacture, a vulcanized insulating material,comprising a disintegrated fabric that is impregnated with oxid of zinc,and a binder comprising rubber, sulfur and liquid glass intermingledtherewith.

In testimony that I claim the foregoing as my own I have hereto a'fIiXedmy signature in the presence of two witnesses.

GEORGE KELLY.

Witnesses:

JOHN I-LSreeERs, BLANCHE J. KALDENBACK.

